Fragment mass distributions in the fission of heavy nuclei by intermediate- and high-energy probes


Autoria(s): Andrade Segundo, Evandro Oliveira; MENEZES, J. C. M.; DUARTE, S. B.; GARCIA, F.; ROSSI, P. C. R.; TAVARES, O. A. P.; Deppman, Airton
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2011

Resumo

Recent experiments have shown that the multimode approach for describing the fission process is compatible with the observed results. Asystematic analysis of the parameters obtained by fitting the fission-fragment mass distribution to the spontaneous and low-energy data has shown that the values for those parameters present a smooth dependence upon the nuclear mass number. In this work, a new methodology is introduced for studying fragment mass distributions through the multimode approach. It is shown that for fission induced by energetic probes (E > 30 MeV) the mass distribution of the fissioning nuclei produced during the intranuclear cascade and evaporation processes must be considered in order to have a realistic description of the fission process. The method is applied to study (208)Pb, (238)U, (239)Np and (241)Am fission induced by protons or photons.

CNPq

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

FAPESP

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Identificador

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, v.38, n.8, 2011

0954-3899

http://producao.usp.br/handle/BDPI/29128

10.1088/0954-3899/38/8/085104

http://dx.doi.org/10.1088/0954-3899/38/8/085104

Idioma(s)

eng

Publicador

IOP PUBLISHING LTD

Relação

Journal of Physics G-nuclear and Particle Physics

Direitos

restrictedAccess

Copyright IOP PUBLISHING LTD

Palavras-Chave #PROTON-INDUCED FISSION #CRISP CODE #PHOTONUCLEAR REACTIONS #NEUTRON MULTIPLICITY #U-238 #MODEL #SCISSION #CASCADE #FRAME #F) #Physics, Nuclear #Physics, Particles & Fields
Tipo

article

original article

publishedVersion